Sushil defeated Russian Gogaev to win the 66 kg freestyle title on Sunday to become the first Indian to win a gold medal in World Wrestling Championship.
Congratulating him, Mamata said it is the spirit, drive and dedication of Sushil that has lead to personal achievement and national glory.
"His victory is a victory for the 'Rail Parivar' and dedicated to the nation," she said.
Sushil is the third Railwayman to brought laurels in World Wrestling Championship. Railway sportspersons Bishambar Singh and Ramesh Kumar had won a silver and a bronze in the World Wrestling Championships in 1967 and 2009 respectively.

Sushil Kumar is World wrestling championThe Hindu
Sushil Kumar made history by becoming the first Indian to win a World wrestling championship gold medal when he overpowered home favourite Alan Gogaev to win the 66kg freestyle title in Moscow on Sunday.
The exciting 3-1 victory in the title-bout also made Sushil the first Indian grappler to bag Olympic and World championship medals. The 27-year-old already holds the Asian and Commonwealth titles.
On his way to the final, Sushil convincingly defeated Anastasios Akritidis of Greece (6-0), Martin Sebastian Daum of Germany (4-1) and Batzorig Buyanjar of Mongolia (9-1) before rallying to beat reigning European champion Jabrayil Hasanov of Azerbaijan (4-3).
Historic triumph
In the final, Sushil got the better of Gogaev in two straight rounds, winning 2-1 and 1-0 and sealing a historic triumph.

The Delhi wrestler had won the bronze in the 2008 Beijing Olympic Games, becoming the second Indian wrestler, the first being K.D. Jadhav, to achieve the distinction.
Last year in Denmark, Ramesh Kumar had broken India's long medal drought in the World championship by returning a bronze in the 74-kg category.
The other World championship medallists from India were Uday Chand (bronze in 1961), Bishambhar Singh (silver in 1967) and Alka Tomar (bronze in 2006).
The Wrestling Federation of India (WFI) President G.S. Mander was quick to hail Sushil's feat.
“Sushil had proved his mettle at every level and now he has done it at the World level. It is a big thing to be the World, Asian and Commonwealth champion at the same time,” Mander said.
Sushil had won the Commonwealth championship in Jalandhar in December last and the Asian title here in May.
Welcome change
“In the midst of so much negative publicity doing the rounds (due to drug abuse in Indian sport), this is a welcome change,” Mander added.
The WFI Secretary and former Asian Games gold medallist Kartar Singh, too, expressed his joy after Sushil won the gold.
“I am very happy with his achievement. The country expected him to win the gold and he did it,” said Kartar.
“When I spoke to him, he said that it was due to God's grace. He said the competition was very tough, especially the semifinal against the European champion was a difficult bout.
“ had advised Sushil to give his best even against the fancied Russian wrestler (in the final) as such chances come very rarely in life, so he should grab it with both hands,” Kartar said.
Kartar hoped that the Commonwealth Games gold at home should not be a difficult thing to achieve for Sushil.
The WFI declared that a befitting welcome and suitable reward await the star wrestler on his return from Moscow.
The 1982 Asian Games gold medallist, Satpal, also showered praise on Sushil. “He had prepared well, otherwise it is not easy to win five straight bouts in day.
“Undoubtedly, he is the best wrestler India has ever produced. His humility and sincerity has made him what he is,” said Satpal.

WELCOME

Most countries have a traditional style of wrestling. In India, wrestling takes place in a clay or dirt pit. The soil is mixed with ghee and other things and is tended to before each practice.

Traditional Indian wrestling isn't just a sport - it's an ancient subculture where wrestlers live and train together and follow strict rules on everything from what they can eat to what they can do in their spare time. Drinking, smoking and even sex are off limits. The focus is on living a pure life, building strength and honing their wrestling skills.

The purpose of this blog is to raise awareness about the sport and give people inside and outside of India a glimpse of what it is like.